package demo3;

public class Computer {
    public void powerOn(){
        System.out.println("打开笔记本电脑");
    }
    public void powerOff(){
        System.out.println("关闭电脑");
    }
    public void useDeivce(IUSB usb){
        usb.openDevice();
        if(usb instanceof  Mouse){
            /*Mouse mouse = (Mouse) usb;
            mouse.click();*/
            ((Mouse) usb).click();
        }else if(usb instanceof KeyBoard){
            ((KeyBoard)usb).input();
        }
        usb.closeDevice();
    }

}
